Adding CSliderCtrl in CStatusBar in MFC application - visual-c++

Question

I am trying to add to CSliderCtrl in CStatusBar. For this
- Created CSliderCtrl in CMainFrame class
- In CMainFrame::OnCreate() added code for creating statusbar and slider bar control as
bStatus = m_ZoomSlider.Create(
WS_CHILD | WS_VISIBLE,
CRect(0, 0, 100, 30),
&m_StatusBar,
56666);
Things are working fine.
Now I want this slider to be on the right side of the status bar. For this I've added a INDICATOR in the status bar and I am trying to get the rect of this indicator and placing the slider over that rect.
CRect rectSlider;
m_StatusBar.GetItemRect(1, &rectSlider);
bStatus = m_ZoomSlider.Create(
WS_CHILD | WS_VISIBLE,
rectSlider,
&m_StatusBar,
56666);
Here the rectSlider is having negative value, causing the slider to be invisible.
I need to know Is this the correct way for doing this. Any suggestion for advice will be very helpful.
I am using Visual Studio 2005.

Answer 1

You should be using GetRect rather than GetItemRect, I think

Answer 2

The slider control cannot be displayed because its Z-order is not correct. So override on resize to reposition the slider properly. &CWnd::wndTop means placing the window at the top of the Z-order
Firstly, define CSliderCtrl *m_pZoomSlider in MainFrame.h
The following code used the lazy initialization pattern: initialize when required, free the allocated memory when frame is being destroyed.
BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)
...
ON_WM_SIZE()
END_MESSAGE_MAP()
void CMainFrame::SetSliderPosition(int pos)
{
if (!m_pZoomSlider) {
CRect rectSlider;
m_wndStatusBar.GetItemRect(1, &rectSlider);
rectSlider.DeflateRect(1, 1); // 1 pixel border...
m_pZoomSlider = new CSliderCtrl();
m_pZoomSlider->Create(WS_CHILD | WS_VISIBLE, rectSlider, &m_wndStatusBar, ID_INDICATOR_SCALE_SLIDER);
m_pZoomSlider->SetRange(1, 100);
}
RECT rc;
m_wndStatusBar.GetItemRect(pos, &rc);
// Reposition the slider control correctly!
m_pZoomSlider->SetWindowPos(&CWnd::wndTop, rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top, 0);
}
void CMainFrame::OnSize(UINT nType, int cx, int cy)
{
CFrameWnd::OnSize(nType, cx, cy);
SetSliderPosition(1); //index of indicator of status bar
}
BOOL CMainFrame::DestroyWindow()
{
if (m_pZoomSlider) {
m_pZoomSlider->DestroyWindow();
delete m_pZoomSlider;
}
return CFrameWnd::DestroyWindow();
}